@article{StoegglSperlich2014,
  author    = {Thomas St{\"o}ggl and Billy Sperlich},
  title     = {Polarized training has greater impact on key endurance variables than threshold, high intensity, or high volume training},
  journal   = {Frontiers in Physiology},
  volume    = {5},
  number    = {33},
  doi       = {10.3389/fphys.2014.00033},
  year      = {2014},
}